Magnetocrystalline anisotropy and exchange probed by high-field anomalous Hall effect in fully-compensated half-metallic Mn2RuxGa thin films

Abstract

Magnetotransport is investigated in thin films of the half-metallic ferrimagnet Mn${}_2$Ru${}_x$Ga in pulsed magnetic fields of up to 58 T. A non-vanishing Hall signal is observed over a broad temperature range, spanning the compensation temperature 155 K, where the net magnetic moment is strictly zero, the anomalous Hall conductivity is 6673 ${\Omega }^{-1}.m^{-1}$ and the coercivity exceeds 9 T. Molecular field modelling is used to determine the intra- and inter-sublattice exchange constants and from the spin-flop transition we infer the anisotropy of the electrically active sublattice to be 216 kJ/m${}^3$ and predict the magnetic resonances frequencies. Exchange and anisotropy are comparable and hard-axis applied magnetic fields result in a tilting of the magnetic moments from their collinear ground state. Our analysis is applicable to collinear ferrimagnetic half-metal systems.

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Cited by in corpus (8)

• Spin eigen-excitations of an antiferromagnetic skyrmion
• Ultra-fast Double Pulse All-Optical Re-switching of a Ferrimagnet
• Universal criteria for single femtosecond pulse ultrafast magnetization switching in ferrimagnets
• Magnetization dynamics of the compensated ferrimagnet $M{n}_{2}R{u}_{x}Ga$
• Sub-picosecond exchange-relaxation in the compensated ferrimagnet Mn${}_2$Ru${}_x$Ga
• Atomistic spin model of single pulse toggle switching in Mn${}_2$Ru${}_x$Ga Heusler alloys
• Giant coercivity and enhanced intrinsic anomalous Hall effect at vanishing magnetization in a compensated kagome ferrimagnet
• Quasi-static magnetization dynamics in a compensated ferrimagnetic half-metal -- Mn${}_2$Ru${}_x$Ga